I like these "bugs" that go away by themselves...or maybe i had something interfering with the remote, this was what i was using when i noticed it, ...i was using the remote near a window...or the
fluorescent economy lamps ?

They are switched off right now, i still have daylight.

Problem is that i'm getting to know a working UGS....i tend to see gremlins all over the place until i check everything new !

thanks for the feedback guys, now for the serious debugging of my other UGS module.....

But i got a bit of more substantial news; between last post and this one i checked the other module that did not give absolute offset adjust but gave relative adjust....and even played!

I checked all the bias settings and found out that Q12 Vbe was...0V! so Q12 had given up the ghost!

This shows that even if you follow step by step the alignment procedure for the UGS module, this still is possible to creep in, as the doc says we should check Vbe of the transistors only if the specified voltages at the test points is not met.

I would suggest it is changed to require Vbe testing for all bipolars.

After the absolute offset ( which was 245mv and with the new ZTX droped to 84mv ) was adjusted to 0V, the relative offset which was 0V now showed 42mv and needed adjustment ofcourse.